Highest temperature in Hong Kong on July 28?

Platform comparison

Market context

On 28 July 2026, the Hong Kong Observatory will record the day's highest temperature in Celsius to one decimal place. The market currently prices all temperature ranges at 0% probability on Polymarket, reflecting settlement uncertainty rather than meteorological impossibility—the contract cannot resolve until official data publishes, creating a timing lag that often suppresses early trading activity on weather markets with distant settlement dates.

Hong Kong's July climate is consistently hot and humid, with historical daily maxima typically ranging between 32°C and 35°C during the month. The Observatory's records show that extreme heat days exceeding 36°C occur occasionally but remain statistically uncommon; the city's all-time July high stands at 36.6°C. Traders should reference the Observatory's historical daily extract archive to calibrate expectations against comparable years, particularly noting that late July often sits within the peak summer monsoon season when afternoon thunderstorms can suppress afternoon peaks.

The Hong Kong Observatory publishes its daily climate data in the "Daily Extract" section of its Climate Information Services portal, typically finalising readings within 24–48 hours of the calendar date. Traders should monitor tropical cyclone warnings and monsoon activity forecasts in early July 2026, as these systems directly influence whether the day experiences sustained heat or cloud cover that moderates afternoon temperatures. The settlement window closes at 12:00 UTC on 28 July, but resolution itself depends on Observatory publication timing, which may extend beyond that window.

Methodology

This page reviews Highest temperature in Hong Kong on July 28? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.